Related Experiment Video
Updated: Jun 29, 2025
Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
Published on: February 6, 2019
Low Dose Radiation and Solid Tumors Mortality Risk.
Xuguang Grant Tao1, Frank C Curriero, Mahadevappa Mahesh
1From the Division of Occupational and Environmental Medicine, Department of Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland (T.G.X.); Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland (F.C.C.), and the Russell H. Morgan Department of Radiology and Radiological Science and Division of Cardiology Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland (M.M.).
Occupational radiation exposure in nuclear shipyard workers was studied. Low-dose radiation exposure was linked to a significantly lower solid tumor mortality risk, suggesting risk may not be linear at low doses.
Area of Science:
- Occupational Health
- Radiation Epidemiology
- Nuclear Medicine
Background:
- US nuclear capable shipyard workers face potential occupational radiation exposure.
- Understanding the health risks, specifically solid tumor mortality, associated with low-dose radiation is crucial for this population.
Purpose of the Study:
- To investigate the association between low-dose occupational radiation exposure and solid tumor mortality risk.
- To analyze mortality risks in nuclear shipyard workers based on varying radiation dose categories.
Main Methods:
- A cohort study of 437,937 workers from eight US shipyards between 1957 and 2004.
- Analysis included workers with documented radiation exposure and a control group.
- Mortality risks for solid tumors were calculated using relative risks (RR) and confidence intervals (CI) across different dose categories.
Main Results:
- Radiation workers with a median lifetime dose of 0.82 mSv exhibited a significantly lower solid tumor mortality risk (RR: 0.96, 95% CI: 0.94-0.98) compared to non-radiation workers.
- Among radiation workers, solid tumor RRs showed an increasing trend with higher dose categories, though not statistically significant.
- The dose category of >0-<25 mSv was associated with a significantly lower RR (0.95, 95% CI: 0.91-0.99) compared to the 0 dose group, with an excess relative risk of 0.05/100 mSv (95% CI: 0.01-0.08).
Conclusions:
- Solid tumor risk may increase with radiation dose, but this relationship appears non-linear at low doses.
- The actual mortality risk associated with radiation exposure is likely dependent on the specific dose received.
- Findings suggest a potential protective effect or complex dose-response relationship at low occupational radiation exposure levels.
